High Bandwidth Current Sensor

| Information and Communication Technology

High bandwidth open loop HOB-P sensor for harsh environments

Open loop multi-range current sensor with high cut-off frequency measures DC, AC or pulsed current up to 250A

LEM has introduced a high bandwidth (1MHz) open loop sensor capable of current sensing in some of the harshest environments. This new addition completes the full range of sensors offering high performance across four nominal currents. The low power consuming HOB-P series of current transducers was developed specifically to meet high bandwidth sensing requirements when using fast-switching silicon carbide (SiC) MOSFETs in high-voltage pulsed-power circuits where fast and flexible high-voltage pulses are essential.

With a response time of < 200 ns – compared to average response times of around 3 microseconds – the HOB-P sensor is capable of measuring DC, AC or pulsed current up to 250A. Thanks to a pick-up coil on LEM’s application specific integrated circuit (ASIC), the sensor is capable of reacting like a current transformer. At the same time, it is ideally suited to wide bandgap (WBG) power electronics applications that require enhanced immunity to the dv/dt (acceleration) issues that SiC power modules are prone to. The new sensor delivers much better dv/dt behaviour and lower noise than other sensors on the market.

Features of the HOB-P sensor include galvanic separation between the primary and secondary circuit, an integrated busbar and a compact design that enables space-saving THT (through hole technology) PCB mounting.

Jonathan Newell
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